21. If a train runs at 40 km/h, it reaches its destination
late by 11 min. But, if it runs at 50 km/h, it is late
by 5 min only. The correct time for the train to
complete its journey is
(a) 15 min
(b) 21 min
(c) 13 min
(d) 19 min
Answers
Answered by
5
Answer:
19 min
Let the correct time for the train to complete the journey is x minuets
Then train cover distance in x+11 minuets at speed 40 km\hr =
60
40(x+11)
km
Then train cover distance in x+5 minuets at speed 50 km\hr =
60
50(x+5)
km
Both are same then
60
40(x+11)
=
60
50(x+5)
∴40x+440=50x+250
∴−10x=−190
∴x=19 minutes
Answered by
1
Step-by-step explanation:
If a train runs at 40 Km/hr, it reaches its destination late by 11 minutes, but if it runs at 50 km/hr, it is late by 5 minutes only. The correct time for the train to complete its journey is. A) 13 min.
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